428493278 has 4 divisors (see below), whose sum is σ = 642739920. Its totient is φ = 214246638.

The previous prime is 428493277. The next prime is 428493293. The reversal of 428493278 is 872394824.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428493277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107123318 + ... + 107123321.

It is an arithmetic number, because the mean of its divisors is an integer number (160684980).

Almost surely, 2^428493278 is an apocalyptic number.

428493278 is a deficient number, since it is larger than the sum of its proper divisors (214246642).

428493278 is a wasteful number, since it uses less digits than its factorization.

428493278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214246641.

The product of its digits is 774144, while the sum is 47.

The square root of 428493278 is about 20700.0791785925. The cubic root of 428493278 is about 753.9016105696.

The spelling of 428493278 in words is "four hundred twenty-eight million, four hundred ninety-three thousand, two hundred seventy-eight".